Implementation of TagParser::Tag for ID3v2 tags. More...

#include <id3v2tag.h>

Inheritance diagram for TagParser::Id3v2Tag:

Collaboration diagram for TagParser::Id3v2Tag:

Public Member Functions
	Id3v2Tag ()
	Constructs a new tag.

TagTextEncoding	proposedTextEncoding () const override
	Returns the proposed text encoding.

bool	canEncodingBeUsed (TagTextEncoding encoding) const override
	Returns an indication whether the specified encoding can be used to provide string values for the tag.

bool	supportsDescription (KnownField field) const override
	Returns an indications whether the specified field supports descriptions.

bool	supportsMimeType (KnownField field) const override
	Returns an indications whether the specified field supports mime types.

bool	supportsMultipleValues (KnownField field) const override
	Allows multiple values for some fields.

void	ensureTextValuesAreProperlyEncoded () override
	Ensures the encoding of all assigned text values is supported by the tag by converting the character set if necessary.

void	parse (std::istream &sourceStream, const std::uint64_t maximalSize, Diagnostics &diag)
	Parses tag information from the specified stream.

Id3v2TagMaker	prepareMaking (Diagnostics &diag)
	Prepares making.

void	make (std::ostream &targetStream, std::uint32_t padding, Diagnostics &diag)
	Writes tag information to the specified stream.

Id3v2HandlingFlags	handlingFlags () const
	Returns flags influencing the behavior when parsing/making the ID3v2 tag.

void	setHandlingFlags (Id3v2HandlingFlags flags)
	Sets flags influencing the behavior when parsing/making the ID3v2 tag.

std::uint8_t	majorVersion () const
	Returns the major version if known; otherwise returns 0.

std::uint8_t	revisionVersion () const
	Returns the revision version if known; otherwise returns 0.

void	setVersion (std::uint8_t majorVersion, std::uint8_t revisionVersion)
	Sets the version to the specified majorVersion and the specified revisionVersion.

bool	isVersionSupported () const
	Returns an indication whether the version is supported by the Id3v2Tag class.

std::uint8_t	flags () const
	Returns the flags read from the ID3v2 header.

bool	isUnsynchronisationUsed () const
	Returns an indication whether unsynchronisation is used.

bool	hasExtendedHeader () const
	Returns an indication whether an extended header is used.

bool	isExperimental () const
	Returns an indication whether the tag is labeled as experimental.

bool	hasFooter () const
	Returns an indication whether a footer is present.

std::uint32_t	extendedHeaderSize () const
	Returns the size of the extended header if one is present; otherwise returns 0.

std::uint64_t	paddingSize () const
	Returns the size of the padding between the tag and the first MPEG frame if one is present; otherwise returns 0.

Public Member Functions inherited from TagParser::FieldMapBasedTag< Id3v2Tag >
	FieldMapBasedTag ()
	Constructs a new FieldMapBasedTag.

TagType	type () const
	Returns the type of the tag as TagParser::TagType.

std::string_view	typeName () const
	Returns the type name of the tag as C-style string.

const TagValue &	value (const IdentifierType &id) const
	Returns the value of the field with the specified id.

const TagValue &	value (KnownField field) const
	Returns the value of the specified field.

std::vector< const TagValue * >	values (const IdentifierType &id) const
	Returns the values of the field with the specified id.

std::vector< const TagValue * >	values (KnownField field) const
	Returns the values of the specified field.

bool	setValue (const IdentifierType &id, const TagValue &value)
	Assigns the given value to the field with the specified id.

bool	setValue (KnownField field, const TagValue &value)
	Assigns the given value to the specified field.

bool	setValues (const IdentifierType &id, const std::vector< TagValue > &values)
	Assigns the given values to the field with the specified id.

bool	setValues (KnownField field, const std::vector< TagValue > &values)
	Assigns the given values to the field with the specified id.

bool	hasField (KnownField field) const
	Returns an indication whether the specified field is present.

bool	hasField (const IdentifierType &id) const
	Returns an indication whether the field with the specified id is present.

void	removeAllFields ()
	Removes all fields from the tag.

const std::multimap< IdentifierType, FieldType, Compare > &	fields () const
	Returns the fields of the tag by providing direct access to the field map of the tag.

std::multimap< IdentifierType, FieldType, Compare > &	fields ()
	Returns the fields of the tag by providing direct access to the field map of the tag.

std::size_t	fieldCount () const
	Returns the number of present fields.

IdentifierType	fieldId (KnownField value) const
	Returns the ID for the specified field.

KnownField	knownField (const IdentifierType &id) const
	Returns the field for the specified ID.

bool	supportsField (KnownField field) const
	Returns an indication whether the specified field is supported by the tag.

TagDataType	proposedDataType (const IdentifierType &id) const
	Returns the proposed data type for the field with the specified id.

virtual TagDataType	proposedDataType (KnownField field) const
	Returns the proposed data type for the specified field as TagDataType.

std::size_t	insertFields (const FieldMapBasedTag< Id3v2Tag > &from, bool overwrite)
	Inserts all fields from another tag of the same field type and compare function.

std::size_t	insertValues (const Tag &from, bool overwrite)
	Inserts all compatible values from another Tag.

Public Member Functions inherited from TagParser::Tag
virtual	~Tag ()
	Destroys the Tag.

std::string	toString () const
	Returns a string representation of the tag.

const std::string &	version () const
	Returns the version of the tag as std::string.

std::uint64_t	size () const
	Returns the size the tag within the file it is parsed from in bytes.

virtual bool	supportsTarget () const
	Returns an indication whether a target is supported by the tag.

const TagTarget &	target () const

TagTarget &	target ()
	Returns the target of tag.

void	setTarget (const TagTarget &target)
	Sets the target of tag.

virtual TagTargetLevel	targetLevel () const
	Returns the name of the current tag target level.

std::string_view	targetLevelName () const
	Returns the name of the current target level.

bool	isTargetingLevel (TagTargetLevel tagTargetLevel) const
	Returns whether the tag is targeting the specified tagTargetLevel.

std::string	targetString () const
	Returns the string representation for the assigned tag target.

Static Public Attributes
static constexpr TagType	tagType = TagType::Id3v2Tag

static constexpr std::string_view	tagName = "ID3v2 tag"

static constexpr TagTextEncoding	defaultTextEncoding = TagTextEncoding::Utf16LittleEndian

Protected Member Functions
IdentifierType	internallyGetFieldId (KnownField field) const

KnownField	internallyGetKnownField (const IdentifierType &id) const

TagDataType	internallyGetProposedDataType (const std::uint32_t &id) const

void	internallyGetValuesFromField (const FieldType &field, std::vector< const TagValue * > &values) const
	Adds additional values as well.

bool	internallySetValues (const IdentifierType &id, const std::vector< TagValue > &values)
	Uses default implementation for non-text frames and applies special handling to text frames.

Protected Member Functions inherited from TagParser::FieldMapBasedTag< Id3v2Tag >
const TagValue &	internallyGetValue (const IdentifierType &id) const
	Default implementation for value().

void	internallyGetValuesFromField (const FieldType &field, std::vector< const TagValue * > &values) const
	Default way to gather values from a field in internallyGetValues().

std::vector< const TagValue * >	internallyGetValues (const IdentifierType &id) const
	Default implementation for values().

bool	internallySetValue (const IdentifierType &id, const TagValue &value)
	Default implementation for setValue().

bool	internallySetValues (const IdentifierType &id, const std::vector< TagValue > &values)
	Default implementation for setValues().

bool	internallyHasField (const IdentifierType &id) const
	Default implementation for hasField().

TagDataType	internallyGetProposedDataType (const IdentifierType &id) const
	Default implementation for proposedDataType().

Protected Member Functions inherited from TagParser::Tag
	Tag ()
	Constructs a new Tag.

Friends
class	FieldMapBasedTag< Id3v2Tag >

class	Id3v2TagMaker

Additional Inherited Members
Public Types inherited from TagParser::FieldMapBasedTag< Id3v2Tag >
using	FieldType = typename FieldMapBasedTagTraits< Id3v2Tag >::FieldType

using	IdentifierType = typename FieldMapBasedTagTraits< Id3v2Tag >::FieldType::IdentifierType

using	Compare = typename FieldMapBasedTagTraits< Id3v2Tag >::Compare

Protected Types inherited from TagParser::FieldMapBasedTag< Id3v2Tag >
using	CRTPBase = FieldMapBasedTag< Id3v2Tag >

Protected Attributes inherited from TagParser::Tag
std::string	m_version

std::uint64_t	m_size

std::unique_ptr< TagPrivate >	m_p

TagTarget	m_target

Detailed Description

Implementation of TagParser::Tag for ID3v2 tags.

Definition at line 78 of file id3v2tag.h.

Constructor & Destructor Documentation

◆ Id3v2Tag()

TagParser::Id3v2Tag::Id3v2Tag ( )

inline

Constructs a new tag.

Definition at line 138 of file id3v2tag.h.

Member Function Documentation

◆ canEncodingBeUsed()

bool TagParser::Id3v2Tag::canEncodingBeUsed ( TagTextEncoding encoding ) const

inlineoverridevirtual

Returns an indication whether the specified encoding can be used to provide string values for the tag.

Only the proposedTextEncoding() is accepted by default. This might be overwritten when subclassing.

The tag class and its subclasses do not perform any conversions. You have to provide all string values using an encoding which is appropriate for the specific tag type. This method is meant to determine if a particular encoding can be used.

See also: canEncodingBeUsed()

Reimplemented from TagParser::Tag.

Definition at line 154 of file id3v2tag.h.

◆ ensureTextValuesAreProperlyEncoded()

void TagParser::Id3v2Tag::ensureTextValuesAreProperlyEncoded ( )

overridevirtual

Ensures the encoding of all assigned text values is supported by the tag by converting the character set if necessary.

Reimplemented from TagParser::FieldMapBasedTag< Id3v2Tag >.

Definition at line 59 of file id3v2tag.cpp.

◆ extendedHeaderSize()

std::uint32_t TagParser::Id3v2Tag::extendedHeaderSize ( ) const

inline

Returns the size of the extended header if one is present; otherwise returns 0.

Definition at line 263 of file id3v2tag.h.

◆ flags()

std::uint8_t TagParser::Id3v2Tag::flags ( ) const

inline

Returns the flags read from the ID3v2 header.

Definition at line 223 of file id3v2tag.h.

◆ handlingFlags()

Id3v2HandlingFlags TagParser::Id3v2Tag::handlingFlags ( ) const

inline

Returns flags influencing the behavior when parsing/making the ID3v2 tag.

Definition at line 180 of file id3v2tag.h.

◆ hasExtendedHeader()

bool TagParser::Id3v2Tag::hasExtendedHeader ( ) const

inline

Returns an indication whether an extended header is used.

Definition at line 239 of file id3v2tag.h.

◆ hasFooter()

bool TagParser::Id3v2Tag::hasFooter ( ) const

inline

Returns an indication whether a footer is present.

Definition at line 255 of file id3v2tag.h.

◆ internallyGetFieldId()

Id3v2Tag::IdentifierType TagParser::Id3v2Tag::internallyGetFieldId ( KnownField field ) const

protected

Definition at line 132 of file id3v2tag.cpp.

◆ internallyGetKnownField()

KnownField TagParser::Id3v2Tag::internallyGetKnownField ( const IdentifierType & id ) const

protected

Definition at line 257 of file id3v2tag.cpp.

◆ internallyGetProposedDataType()

TagDataType TagParser::Id3v2Tag::internallyGetProposedDataType ( const std::uint32_t & id ) const

protected

Definition at line 371 of file id3v2tag.cpp.

◆ internallyGetValuesFromField()

void TagParser::Id3v2Tag::internallyGetValuesFromField	(	const FieldType &	field,
		std::vector< const TagValue * > &	values
	)		const

protected

Adds additional values as well.

Definition at line 72 of file id3v2tag.cpp.

◆ internallySetValues()

bool TagParser::Id3v2Tag::internallySetValues	(	const IdentifierType &	id,
		const std::vector< TagValue > &	values
	)

protected

Uses default implementation for non-text frames and applies special handling to text frames.

Ensure text frames are unique.
Allow to store multiple values inside the same text frame.

Definition at line 90 of file id3v2tag.cpp.

◆ isExperimental()

bool TagParser::Id3v2Tag::isExperimental ( ) const

inline

Returns an indication whether the tag is labeled as experimental.

Definition at line 247 of file id3v2tag.h.

◆ isUnsynchronisationUsed()

bool TagParser::Id3v2Tag::isUnsynchronisationUsed ( ) const

inline

Returns an indication whether unsynchronisation is used.

Definition at line 231 of file id3v2tag.h.

◆ isVersionSupported()

bool TagParser::Id3v2Tag::isVersionSupported ( ) const

inline

Returns an indication whether the version is supported by the Id3v2Tag class.

Major versions 2, 3 and 4 are currently supported.

Definition at line 215 of file id3v2tag.h.

◆ majorVersion()

std::uint8_t TagParser::Id3v2Tag::majorVersion ( ) const

inline

Returns the major version if known; otherwise returns 0.

Definition at line 196 of file id3v2tag.h.

◆ make()

void TagParser::Id3v2Tag::make	(	std::ostream &	targetStream,
		std::uint32_t	padding,
		Diagnostics &	diag
	)

Writes tag information to the specified stream.

Exceptions

Throws	std::ios_base::failure when an IO error occurs.
Throws	TagParser::Failure or a derived exception when a making error occurs.

Definition at line 618 of file id3v2tag.cpp.

◆ paddingSize()

std::uint64_t TagParser::Id3v2Tag::paddingSize ( ) const

inline

Returns the size of the padding between the tag and the first MPEG frame if one is present; otherwise returns 0.

Definition at line 272 of file id3v2tag.h.

◆ parse()

void TagParser::Id3v2Tag::parse	(	std::istream &	sourceStream,
		const std::uint64_t	maximalSize,
		Diagnostics &	diag
	)

Parses tag information from the specified stream.

Exceptions

Throws	std::ios_base::failure when an IO error occurs.
Throws	TagParser::Failure or a derived exception when a parsing error occurs.

Definition at line 486 of file id3v2tag.cpp.

◆ prepareMaking()

Id3v2TagMaker TagParser::Id3v2Tag::prepareMaking ( Diagnostics & diag )

Prepares making.

Returns: Returns a Id3v2TagMaker object which can be used to actually make the tag.

Remarks: The tag must NOT be mutated after making is prepared when it is intended to actually make the tag using the make method of the returned object.

Exceptions

Throws TagParser::Failure or a derived exception when a making error occurs.

This method might be useful when it is necessary to know the size of the tag before making it.

See also: make()

Definition at line 606 of file id3v2tag.cpp.

◆ proposedTextEncoding()

TagTextEncoding TagParser::Id3v2Tag::proposedTextEncoding ( ) const

inlineoverridevirtual

Returns the proposed text encoding.

This is TagTextEncoding::Latin1 by default an might be overwritten when subclassing.

The tag class and its subclasses do not perform any conversions. You have to provide all string values using an encoding which is appropriate for the specific tag type. This method returns such an encoding.

See also: canEncodingBeUsed()

Reimplemented from TagParser::FieldMapBasedTag< Id3v2Tag >.

Definition at line 149 of file id3v2tag.h.

◆ revisionVersion()

std::uint8_t TagParser::Id3v2Tag::revisionVersion ( ) const

inline

Returns the revision version if known; otherwise returns 0.

Definition at line 204 of file id3v2tag.h.

◆ setHandlingFlags()

void TagParser::Id3v2Tag::setHandlingFlags ( Id3v2HandlingFlags flags )

inline

Sets flags influencing the behavior when parsing/making the ID3v2 tag.

Definition at line 188 of file id3v2tag.h.

◆ setVersion()

void TagParser::Id3v2Tag::setVersion	(	std::uint8_t	majorVersion,
		std::uint8_t	revisionVersion
	)

Sets the version to the specified majorVersion and the specified revisionVersion.

Definition at line 627 of file id3v2tag.cpp.

◆ supportsDescription()

bool TagParser::Id3v2Tag::supportsDescription ( KnownField field ) const

inlineoverridevirtual

Returns an indications whether the specified field supports descriptions.

Remarks

If you assign a description to a field value and the field does not support descriptions the description is ignored when saving the tag.
The default implementation returns false for all fields. This might be overwritten when subclassing.

Reimplemented from TagParser::Tag.

Definition at line 160 of file id3v2tag.h.

◆ supportsMimeType()

bool TagParser::Id3v2Tag::supportsMimeType ( KnownField field ) const

inlineoverridevirtual

Returns an indications whether the specified field supports mime types.

Remarks

If you assign a mime types to a field value and the field does not support mime types the mime type is ignored when saving the tag.
The default implementation returns false for all fields. This might be overwritten when subclassing.

Reimplemented from TagParser::Tag.

Definition at line 172 of file id3v2tag.h.

◆ supportsMultipleValues()

bool TagParser::Id3v2Tag::supportsMultipleValues ( KnownField field ) const

overridevirtual

Allows multiple values for some fields.

Remarks: The standard defines no general rule applicable to all fields.

Reimplemented from TagParser::Tag.

Definition at line 26 of file id3v2tag.cpp.

Friends And Related Symbol Documentation

◆ FieldMapBasedTag< Id3v2Tag >

friend class FieldMapBasedTag< Id3v2Tag >

friend

Definition at line 49 of file id3v2tag.h.

◆ Id3v2TagMaker

friend class Id3v2TagMaker

friend

Definition at line 80 of file id3v2tag.h.

Member Data Documentation

◆ defaultTextEncoding

constexpr TagTextEncoding TagParser::Id3v2Tag::defaultTextEncoding = TagTextEncoding::Utf16LittleEndian

staticconstexpr

Definition at line 87 of file id3v2tag.h.

◆ tagName

constexpr std::string_view TagParser::Id3v2Tag::tagName = "ID3v2 tag"

staticconstexpr

Definition at line 86 of file id3v2tag.h.

◆ tagType

constexpr TagType TagParser::Id3v2Tag::tagType = TagType::Id3v2Tag

staticconstexpr

Definition at line 85 of file id3v2tag.h.

The documentation for this class was generated from the following files:

id3/id3v2tag.h
id3/id3v2tag.cpp

Public Member Functions

Static Public Attributes

Protected Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Id3v2Tag()

Member Function Documentation

◆ canEncodingBeUsed()

◆ ensureTextValuesAreProperlyEncoded()

◆ extendedHeaderSize()

◆ flags()

◆ handlingFlags()

◆ hasExtendedHeader()

◆ hasFooter()

◆ internallyGetFieldId()

◆ internallyGetKnownField()

◆ internallyGetProposedDataType()

◆ internallyGetValuesFromField()

◆ internallySetValues()

◆ isExperimental()

◆ isUnsynchronisationUsed()

◆ isVersionSupported()

◆ majorVersion()

◆ make()

◆ paddingSize()

◆ parse()

◆ prepareMaking()

◆ proposedTextEncoding()

◆ revisionVersion()

◆ setHandlingFlags()

◆ setVersion()

◆ supportsDescription()

◆ supportsMimeType()

◆ supportsMultipleValues()

Friends And Related Symbol Documentation

◆ FieldMapBasedTag< Id3v2Tag >

◆ Id3v2TagMaker

Member Data Documentation

◆ defaultTextEncoding

◆ tagName

◆ tagType